Implement retainer



March 10, 1931. F. A. JIMERSON IMPLEMENT RETAINER F iled July 6, 1929 IN V EN TOR. Ewan 11176706161012 BY H55 ATTORNEY Patentedlvlar. 1%, 1931 UNET f FRANCIS A. J'IMERSON, OF ATHENS, PENNSYLVANIA, ASSIGNOR TO INGERSOLB-R-AND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY IIVIPLEMENT RETAINER Application filed July 6,

This invention relates to pneumatic tools, but more particularly to implement retainers for too-ls of this type.

One object of the invention is to prevent 5 adherence of the yieldable bufier element to the head of the tool.

Other objects will be in part obvious and Referring to the drawings, A designates the cylinder of a pneumatic tool having a piston chamber B in which is disposed a reciprocatory hammer piston C for delivering blows of impact to a working implement D, the shank end E of which extends into the front end of the piston chamber B. The working implement D may be of any known type having a collar F at the juncture of the body portion of the working implement and at the shank E. V

In the construction shown, the front end of the cylinder A is provided with an enlarged bore G to receive a bushing H which serves as a guide for the shank E of the working implement.

The front end of the cylinder A is provided with exterior threads J on which is threaded a head K having awall K at its front end in which is formed an aperture L through which the body portion of the working implement D extends.

The head K forms a receptacle for cushionin means adapted to coo erate with the a p collar F of the working implement for cushioning the blows of the working implement. The cushioning means illustrated comprises I a rubber bufi'er 0 preferably in the form of a single piece having a longitudinal slot P so that when used with a working implement having a cutting bit of larger diameter than the body portion of the working implement,

I the bufier 0 may be spread to readily dispose 59 it about the working implement.

1929. Serial No. 376,408.

rearward end of the buffer 0 and the collar F.

The bushing Q has an interior shoulder S against which the collar F may impact. The I bore T in the bushing Q, of which the shoulder S forms one end may be ofsuitable depth so that the working implement D will be capable of a'certain degree of reciprocation rela-' tively to the bushing.

L 'Heretofore, in devices of this type employing rubber buffers as a cushioning medium for j the working implement, it has been found that after someuse and upon exposure to a considerable number of heavy blows of the a working implement, the rubber frequently adheres to its container, such as the head K. This is objectionable for various reasons but chiefly because of the considerable amount of time required to remove the buffer from the head Whenever the buffer becomes unfit for-use.

The present invention contemplates the.

- and to this end the retainer is provided with asleeve U in the form of a pair of half"sec-' tions V which are disposed within the head K to encircle the bufier O and also the bushing Q. 'Preferably the sleeve U is provided at its front end with a lateral flangeW which lies against the wall K of the buffer 0 to prevent the bufier from being squeezed into the aperture L. Similarly, at the rearward end' of the sleeve U is formed alateral shoulder X which forms an abutment for the rearward end of the bushing Q. The head K is preferably threaded on'the end of the cylinder A to the point at whichthe flanges W and X bear firmly against the wall'K and the front end of the cylinder A respectively, thus preventing endwise movement of the sleeve U in the head K. 1

sists of a spiral spring Y which encircles the cylinder A and has hooked portions Z and b 1 '75 prevention of this objectionable condition,

which engage notches 0 and (Z of the head K and the cylinder A respectively.

In practice the present invention has been found to function in an unusually satisfactory manner since it entirely eliminates contact between the buffer 0 and the head K and therefore prevents adherence of the butter to the head. Although the force of the blows of the working implement applied to the buffer may cause said buffer to adhere to the sleeve U, this will in no wise hinder tne ready removal of the head K from the cylinder nor the removal of the head from the working implement. When this condition does occur the head K may be removed from the cylinder in the usual manner and thereafter the sleeve sections V may be removed from the buffer and a new buffer substituted to replace that previously used.

I claim:

1. In an implement retainer for pneumatic tools, the combination of a cylinder and a working implement extending into the cylinder, a collar on the working implement, a head secured to the cylinder for retaining the implement in the cylinder, a rubber buffer in the head to form a yieldable abutment for the collar, and a sleeve disposed in the head to prevent contact between the buffer and the head, said sleeve bearing with its ends against the head and the cylinder to maintain said sleeve against endwise movement in the head.

2. In an implement retainer for pneumatic tools, the combination of a cylinder and a working implement extending into the cylinder, a collar on the working implement, a head for retaining the working implement in the cylinder, a rubber buffer in the head forwardly of the collar to cushion'the movement of the working implement, means interposed between the collar and the buffer to distribute the force of the blow of the implement over the entire end area of the buffer, a sleeve disposed in the head to form a container for the buffer and the said means, and a flange at one end of the sleeve forming an abutment for the buffer and preventing squeezing of the buffer from the head.

3. In an implement retainer for pneumatic tools, the combination of a cylinder and a working implement extending into the cylinder, a collar on the working implement, a head for retaining the working implement in the cylinder, a rubber buffer in the-head forwardly of the collar to cushion the move ment of the working implement, means interposed between the collar and the buffer to distribute the force of the blow of the implement over the entire end area of the buffer, a sleeve comprising a pair of half sections disposed in the head to form a container for the buffer and the said means, and lateral shoulders on the ends of the sleeve to hold the said means and the buffer against endwise movement with respect to the sleeve.

4:. In an implement retainer for pneumatic tools, the combination of a cylinder and a working implement extending into the cylinder, a collar on the working implement, a head for retaining the working implement in the cylinder, a rubber buffer in the head forwardly ot the collar to cushion. the movement of the working implement, means posed between the collar and the buffer to distribute the force of the blow of the implement over the entire end area of the buffer, a sleeve encircling the buffer and said means, means for preventing free endwise movement of said means and said buffer in the head, and a recess in the first said means to permit limited free movement of the working implement in the head.

In testimony whereof I have signed this specification.

FRANCIS A. JIMERSON. 

